Door and passage of cinematographic apparatus



Oct. 4, 1932. M. COUADE DOOR AND PASSAGE OF CINEMATOGRAPHIC APPARATUSFiled 001:. 9, 1929 Patented Oct. 4, 1932 PTENT MAURICE COUADE, F PARIS,FRANCE DOOR AND PASSAGE OF CINEMATOGRAIPHIC APPARATUS Application filedOctober 9, 1929, Serial No. 3538,48 and in France October 17, 1928.

Devices for doors and passages of cinen'iatographic apparatus comprisegenerally; a rectilinear passage provided with a projec ing window andone or several openings E0 the passage of claws or engaging teeth,

door provided with a rigid pressing frame and also provided with anopening for toe passage of the luminous rays, and springs interposedbetween the door and the frame so as to ensure, in the closing positionof the door, the application of the frame against the film and thepressing of the latter in the passage.

, Such devices require a certain distance between the condenser and thefilm.

The device forming the subject matter of the present invention enablesthis distance to be reduced to the minimum, just sufiiciently to permitthe passage of the film in the duct.

This reduction is very advantageous because the luminous efficiency ofthe li hting system is thereby increased and at the same time theemployment of small and cheap condensers is rendered possible.

The device comprises the combination of three following means:

1. A passage or duct with a curved longitudinal section, the film beingdisposed upon its convex surface;

2. A pressing system applying the film in two points, one point beingsituated above the projecting opening and the other below, between thisopening and the claw-opening;

3. A winding up system for the film, exert ing a traction upon thelatter on its leaving the duct.

This combination ensures the following effects:

1. During the masking period the film is perfectly applied toward thebottom of the duct or passage owing to the action of two forces one dueto the traction of the claw pulling below, and the other being due tothe retarding action of the presser, in the upper part. During theperiod of exposure the film is not pulled below by the claws and remainsperfectly applied against the borders of the opening for the projectionwithout risk of floating in the exposed surface, even though therigidity of the film be imperfect. At e other part, the film remainsimmovable if the pull of the winding up roller is less than the stoppageexerted by the presser.

2. The film applied equally against the borders of the opening for theclaws owing to the curvature of the duct and to the traction of thewinding up roller, is easily caught by the claws which extend into theperforations.

3. The condenser carried by the door, can be approached so as to nearlytouch the film, since there is nothing between them.

The pressing system comprises two spring blades fixed to the door andapplying their rounded extremities against the film and hence pressingthe film against the bottom of the duct. These extremities are providedwith ribs in case of need.

In the accompanying drawing Figure 1 is a vertical sectional view of acinematographic apparatus constructed and arranged in accordance withthis invention.

Figure 2 is a similar view of a modified construction of the same.

The gate 1 presents a convex face for the passage of a film thereover,is provided with a duct 2 on its convex face for the passage of the film7 and is also provided with the projecting opening 3 and the clawopening 4. The door 5 has the condenser 6 and is also provided, on theinner side, with spring blades 8, 9 which extend in opposite directionsand have curved outer ends which bear on the film at points spaced fromopposite sides of t 1e projection opening and serve to press the filmagainst the convex face of the gate. The winding up mechanism is nothere shown, as it is of the usual well known construction and forms nopart of the present invention.

The arrow 10 indicates the traction exerted upon the film.

The pressing system can also consist of a single spring blade adaptingitself in its con tr l part provided with a window, to the and beingprovided with two branches 1 in the forward direction, the rounded offextremities of these branches applying elastically against the film. Thesaid extreniities are, as said, provided With ribs in case of emergency.

Figure 2 represents the device according to the said modification.

5 11 is the spring blade provided with a Window 12; 13 and 14: are thetWo branches of this blade.

What I claim, is: Apparatus of the class described, comprising a gatepresenting a coveX face for the passage of a film thereover and having aprojection opening and also a claw opening, a closure having a condenserand a pair of spring blades attached to the inner side of 15 the closureextending in opposite directions and having curved outer ends arranged,When the closure is in closed position, to bear on the fihn at pointsspaced from opposite sides of the projection opening and serving topress the film against said convex face of the gate. In Witness whereofI afliX my signature.

MAURICE GOUADE.

